A pendulum consists of a 2.8 kg stone swinging on a 4.2 m string of negligible mass. The stone has a speed of 7.6 m/s when it passes its lowest point. (a) What is the speed when the string is at 56 °to the vertical? (b) What is the greatest angle with the vertical that the string will reach during the stone's motion? (c) If the potential energy of the pendulum-Earth system is taken to be zero at the stone's lowest point, what is the total mechanical energy of the system? (a) Number Unit (b) Number Unit (c) Number Unit > > >

Suppose that 60 J of work is done to stretch a bow a distance of 0.5 m.  (a)  What is the increase in potential energy of the bow?  (b)  If the spring constant of the bow is 1200 Nt/m, what distance was the bow stretched?

A pendulum consists of a 1.2 kg stone swinging on a 4.2 m string of negligible mass. The stone has a speed of 8.3 m/s when it passes its lowest point. (a) What is the speed when the string is at 56" to the vertical? (b) What is the greatest angle with the vertical that the string will reach during the stone's motion? (c) If the potential energy of the pendulum-Earth system is taken to be zero at the stone's lowest point, what is the total mechanical energy of the system? (a) Number i Unit (b) Number i Unit (c) Number i Unit

An object of mass 10 kg is released at point A, slides to the bottom of the 30 incline,then collides with a horizontal massless spring, compressing it a maximum distance of0.75 m. (See below.) The spring constant is 500 N/m, the height of the incline is 2.0m, and the horizontal surface is frictionless. (a) What is the speed of the object at thebottom of the incline? (b) What is the work of friction on the object while it is on theincline? (c) The spring recoils and sends the object back toward the incline. What is thespeed of the object when it reaches the base of the incline? (d) What vertical distancedoes it move back up the incline?

Tarzan swings on a 39.0-m-long vine initially inclined at an angle of 38.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? m/s(b) What is his speed at the bottom of the swing if he pushes off with a speed of 5.00 m/s?

At the low point in its swing, a pendulum bob with a mass of 0.15kg has a velocity of 14 m/s. A.) What is its potential energy at the high point (assuming the potential energy at the low point was zero)? B.) what is its kinetic energy at the high point?

A 0.40-kg mass attached to a spring is pulled back horizontally across a table so that the potential energy of the system is increased from zero to 155 J. Ignoring friction, what is the kinetic energy of the system after the mass is released and has moved to a point where the potential energy has decreased to 70 J?